JP3714735B2 - Display element holding frame and display device using the same - Google Patents

Display element holding frame and display device using the same Download PDF

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Publication number
JP3714735B2
JP3714735B2 JP22418196A JP22418196A JP3714735B2 JP 3714735 B2 JP3714735 B2 JP 3714735B2 JP 22418196 A JP22418196 A JP 22418196A JP 22418196 A JP22418196 A JP 22418196A JP 3714735 B2 JP3714735 B2 JP 3714735B2
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display element
holding
holding frame
liquid crystal
crystal display
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JPH1068932A (en
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博臣 植田
晃 村上
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Sharp Corp
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Sharp Corp
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Priority to TW086111698A priority patent/TW390969B/en
Priority to US08/912,557 priority patent/US5889623A/en
Priority to KR1019970040587A priority patent/KR100272211B1/en
Publication of JPH1068932A publication Critical patent/JPH1068932A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133314—Back frames
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133322—Mechanical guidance or alignment of LCD panel support components
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • G02F2201/503—Arrangements improving the resistance to shock

Description

【０００１】
【発明の属する技術分野】
本発明は、ＡＶ装置、ＯＡ端末機及び広告表示装置等における情報表示に使用される液晶表示装置等の表示装置に用いられる表示素子を保持するのに好適な表示素子保持枠及びこの表示素子保持枠を備えた表示装置に関する。
【０００２】
【従来の技術】
従来から、卓上テレビ、ディスクトップ型のパーソナルコンピュータ、ワードプロセッサ等の表示装置として液晶表示装置が用いられている。ここで、液晶表示装置内での液晶表示素子の固定構造としてはスペーサを用いるものが一般的であり、例えば特開平６−１３８４４３号公報及び特開平６−３４７７６２号公報に開示されている。
【０００３】
特開平６−１３８４４３号公報に開示された固定構造では、図１１に示すように、角枠状の保持枠１の内側に配置された照明装置２の上に、シリコン製のスペーサ３ａを介して液晶表示素子４を載せ、また液晶表示素子４の周囲に配置されたプリント基板５をスポンジ製のスペーサ３ｂを介して保持枠１の上に載せる。そして、表示窓をもつ上フレーム６を被せ、液晶表示素子４をスペーサ３ａを介して表面側から押圧する。また、プリント基板５をスポンジスペーサ３ｂを介して表面側から押圧する。
【０００４】
この固定構造によると、液晶表示素子４は表面側及び裏面側からスペーサ３ａ，３ａに挟まれて固定される。従って、この固定構造によれば、液晶表示素子４の上下方向、即ちＺ方向の耐衝撃性及び耐振動性を向上できる。
【０００５】
特開平６−３４７７６２号公報に開示された固定構造では、図１２に示すように、照明装置２の上にスペーサ３を介して液晶表示素子４を載せる。液晶表示素子４の外縁部に形成されたガラス電極部の表面に、両面に粘着層が形成された樹脂薄板からなるストライプ状のスペーサ８を貼り付け、上フレーム６の内縁部に裏面側へ突出して形成された突起６ａ，６ａにてスペーサ８を押圧する。
【０００６】
これらのスペーサによる固定構造とは別に、液晶表示素子を保持枠により固定する構造のものもある。この固定構造を用いた液晶表示装置を図１３に示し、その保持枠を下フレームとともに図１４に示す。
【０００７】
下フレーム４０内に収納される保持枠２０は、角枠状の保持枠本体２１と、保持枠本体２１の内縁部四隅に設けられた固定部２２とを有する。各固定部２２は保持枠本体２１の表面側（上面側）に突出し、平面視で直角に折れ曲がった形状に形成されており、液晶表示素子１０を表面に平行な２方向、即ち長辺に平行なＸ方向と短辺に平行なＹ方向に固定する。保持枠本体２１の内側に配置された照明装置の上に、シリコン製のスペーサ６０を介して液晶表示素子１０を載せ、その上に別のシリコン製のスペーサ６０を載せて、表面側から上フレーム３０を保持枠２０にねじ止めすることにより、液晶表示素子１０は固定される。
【０００８】
この状態で、保持枠２０の４隅の固定部２２は、液晶表示素子１０の各角部を挟む端面に当接して（図１５参照）、液晶表示素子１０をＸ方向とＹ方向に固定する。なお、１１ａ及び１１ｂ，１１ｂはプリント基板で、１１ａはコモン基板、１１ｂ，１１ｂはセグメント基板である。
【０００９】
【発明が解決しようとする課題】
ところで、特開平６−１３８４４３号公報及び特開平６−３４７７６２号公報に開示されている固定構造では、液晶表示素子４は基本的に表面側及び裏面側からスペーサにより挟まれて固定されているだけであるので、表面に平行な方向の衝撃、つまりＸ方向及びＹ方向に作用する衝撃力や振動に対してはその方向に位置ずれを生じやすい。
【００１０】
固定された液晶表示素子４がＸ方向又はＹ方向にずれると、液晶表示素子４とその周囲のプリント基板５を電気的に接続するフレキシブル回路基板７に該当する方向の力が作用するため、フレキシブル回路基板７に剥がれや断線が生じ、液晶表示装置の品位を損ねるおそれがある。
【００１１】
なお、液晶表示素子４の位置ずれによるフレキシブル回路基板７の損傷を防止するために、特開平６−１３８４４３号公報に開示された固定構造では、プリント基板５をスポンジ製のスペーサ３ｃの上に載せて、液晶表示素子４の動きにプリント基板５が追従するようにしているが、外部からの衝撃力が大きい場合は、これに対応して変位量も大きくなるため、かかる構造ではフレキシブル回路基板７の破損を確実に防止することができない。
【００１２】
一方、図１３及び図１４に示すような保持枠２０による固定構造では、保持枠本体２１の内縁部四隅に設けられた４つの固定部２２により、液晶表示素子１０がＸ方向及びＹ方向に確実に位置決めされる。
【００１３】
しかしながら、この固定構造では、液晶表示素子１０は、いわば剛体接合されているため、例えばＸ方向又はＹ方向に外部から衝撃力や振動が作用すると、その角部、つまりガラス電極部１０ａの角部に応力集中を生じる。
【００１４】
ここで、図示例の液晶表示素子１０はＸ方向の長さがＹ方向の長さよりも長くなっている。このため、同一の衝撃力であれば、Ｙ方向に特に応力集中が発生し易くなっている。この結果、この固定構造では、外部からの衝撃力や振動が液晶表示素子１０に加わった場合に、角部のＹ方向に許容値を超える応力が発生し易く、これに起因して角部に図１５に示すような割れ（応力割れ）Ｃが生じるという問題があった。
【００１５】
本発明はかかる事情に鑑みてなされたものであり、外部から衝撃を受けたときの表示素子の位置ずれ及び応力集中による表示素子の損傷を確実に防止できる表示素子保持枠及びこの表示素子保持枠を備えた表示装置を提供することを目的とする。
【００１６】
【課題を解決するための手段】
本発明の表示素子保持枠は、角枠状をなし、内縁部で平板状の表示素子を保持・固定する保持枠本体と、該保持枠本体の各隅部に、該表示素子を固定するようにそれぞれ設けられた固定部とを備え、該保持枠本体における第１の辺の両側に設けられた各固定部が、該表示素子の対応する角部を挟む２つの端面にそれぞれ当接し、該保持枠本体における第１の辺に対向する第２の辺の両側に設けられた各固定部が、該第２の辺に沿った前記表示素子の端面にのみそれぞれ当接するようになっており、該保持枠本体の内縁部には、前記表示素子における前記第１および第２の辺以外の各辺に沿った端面にそれぞれ当接して、該表示素子に作用する外力を受け止める複数の保持部が設けられており、該複数の保持部が、前記保持枠本体の第２の辺の端部に近い位置ほど密に配設されていることを特徴とし、そのことにより上記目的が達成される。
【００１８】
また、好ましくは、前記保持部の前記表示素子の端面に対向する面を、該端面に平行にする。
【００１９】
また、好ましくは、前記保持部の前記表示素子の端面に対向する面を、該端面に対して外側に傾斜させる。
【００２０】
また、好ましくは、前記保持枠本体の隅部の少なくとも一箇所に前記表示素子を固定する固定部を設ける。
【００２１】
また、本発明の表示装置は、平板状の表示素子と、該表示素子の周囲に配設され、該表示素子を駆動する駆動回路を有するプリント基板と、該プリント基板を該表示素子に電気的に接続するフレキシブル回路基板と、該表示素子を該プリント基板及び該フレキシブル回路基板と共に保持する表示素子保持枠と、該表示素子、該プリント基板、該フレキシブル回路基板及び該表示素子保持枠を収納し、これらを保持する上下フレームとを備え、該表示素子保持枠が、上記いずれかに記載の表示素子保持枠であり、そのことにより上記目的が達成される。
【００２２】
好ましくは、前記表示素子保持枠の前記保持部が、隣接するフレキシブル回路基板の間に位置し、且つ前記プリント基板の内縁部に設けられた切り欠き部に嵌合する構成とする。
【００２３】
また、好ましくは、前記保持部の少なくとも一の保持部が前記上フレームに当接する構成とする。
【００２４】
以下に作用を説明する。
【００２５】
上記のような保持部を設けると、表示素子に外部から衝撃力や振動が加わり、表示素子にその表面に平行な方向の衝撃力が加わると、この衝撃力を保持部が受けとめ、衝撃力を吸収する。従って、例えばこの保持部を保持枠本体の１辺に複数配設しておくと、各保持部が略均等にこの衝撃力を吸収するので、表示素子に発生する応力が分散される。即ち、応力集中を緩和できる。このため、表示素子の角部に応力割れが発生することがない。
【００２６】
ここで、複数の保持部を設けるに際し、その位置は、例えば１辺の端部に近い位置ほど密に設けるとよい。即ち、このようにすれば、応力集中を発生し易い箇所に、より多くの保持部が配設されるので、その分、応力集中を緩和できる機能を向上でき、応力割れを一層効率よく防止できるからである。
【００２７】
また、本発明の表示装置において、上記した保持部は、プリント基板に嵌合し、これを保持する機能も有している。従って、プリント基板を保持する保持部材を別途設ける必要がないので、部品点数の削減に寄与できる。
【００２８】
また、保持部を上フレームに当接させる構成によれば、組み付け状態において、上フレームの位置決めを行うことができるので、上フレームが不測に変形することがない。
【００２９】
【発明の実施の形態】
以下に本発明の実施の形態を図面に基づいて説明する。
【００３０】
図１は単純マトリックス方式の液晶表示装置に本発明を適用した実施形態を示す。この液晶表示装置は、上フレーム３０、液晶表示素子１０、表示素子保持枠２０及び下フレーム４０を備え、これらの部材をビス止めして一体化し、かつ上フレーム３０をカシメて下フレーム４０を固定した基本構造になっている。
【００３１】
液晶表示素子１０は、図上前後方向に長い長方形であって、その周囲にはプリント基板、即ちコモン基板１１ａ及びセグメント基板１１ｂ，１１ｂが設けられている。より具体的には、コモン基板１１ａは、液晶表示素子１０の図上前側の短辺側にあって、フレキシブル回路基板１２（図６（ａ）参照）により液晶表示素子１０と電気的に接続されている。セグメント基板１１ｂ，１１ｂは、液晶表示素子１０の左右両側に相当する長辺側にあって、フレキシブル回路基板１２により液晶表示素子１０と電気的に接続されている。セグメント基板１１ｂ，１１ｂの一端部にはアース端子１４，１４が取り付けられている。
【００３２】
なお、以下の説明では、液晶表示素子１０の長辺に平行な方向をＸ方向、短辺に平行な方向をＹ方向、厚み方向をＺ方向と称する。また、コモン基板１１ａが設けられた短辺側をコモン基板側、他方の短辺側を反コモン基板側と称する。
【００３３】
液晶表示素子１０は、本発明の表示素子保持枠２０を用いて液晶表示装置内に保持される。表示素子保持枠２０は、表示窓をもつ上フレーム３０と皿状の下フレーム４０との間に収納される。上フレーム３０は、表示素子保持枠２０の表面にネジ３１及びカシメにより取り付けられる。下フレーム４０は、図２に示すように、表示素子保持枠２０の裏面にネジ４１により取り付けられる。表示素子保持枠２０には、裏面側から複数本の光源５０が取り付けられる。光源５０の上には、図３に示すように、下から上に拡散板５１、拡散シート５２、レンズ５３及び保護シート５４が空気層を介して積層され、これらによって構成された照明装置の上に液晶表示素子１０が配置される。
【００３４】
表示素子保持枠２０は、図４に示すように、液晶表示素子１０とほぼ同じ大きさの開口部をもつ角枠状の保持枠本体２１を有する。保持枠本体２１の外縁部には、ネジ孔をもつ取り付け用の凸部２４が設けられている。保持枠本体２１の内縁部四隅には、保持枠本体２１の表面側に突出する突起からなる固定部２２ａ，２２ａ，２２ｂ，２２ｂが設けられている。加えて、保持枠本体２１の内縁部には、反コモン基板側の短辺を除く各辺に沿って、各辺複数の保持部２３ａ，２３ｂ，２３ｂが設けられている。
【００３５】
固定部２２ａ，２２ａ，２２ｂ，２２ｂ及び保持部２３ａ，２３ｂ，２３ｂはコモン基板側と反コモン基板側とで構成が異なる。コモン基板側では、図５（ａ）に示すように、固定部２２ａは、平面視で直角に折れ曲がった形状に形成されており、２つの受止め部が液晶表示素子１０の角部を挟む２つの端面に当接する。複数の保持部２３ａは、Ｙ方向に等間隔で並んで液晶表示素子１０のコモン基板側の端面に当接する。
【００３６】
反コモン基板側では、図５（ｂ）及び図６に示すように、２つの固定部２２ｂ，２２ｂは、Ｙ方向のみに突出部を有する形状に形成されており、この突出部が液晶表示素子１０の反コモン基板側の端面に当接する。即ち、コモン基板側とは異なり、一方の端面のみに当接している。両側の長辺に沿って設けられた保持部２３ｂ，２３ｂは、反コモン基板側の端部を除いて等間隔で並び、反コモン基板側の端部では固定部２２ｂ，２２ｂに接近するように密な間隔で並んでいる。これは反コモン基板側の固定部２２ｂ，２２ｂが液晶表示素子１０をＹ方向に固定する機能を持たず、その機能を保持部２３ｂ，２３ｂが分担するからである。
【００３７】
ここで、反コモン基板側では固定部２３ｂ，２３ｂが液晶表示素子１０をＹ方向に固定する機能を持たず、コモン基板側では固定部２３ａ，２３ａが液晶表示素子１０をＸ方向及びＹ方向に固定するのは、Ｙ方向に外部からの衝撃力が作用した場合に、液晶表示素子１０の角部に応力集中が生じ、この部分に割れが発生するのを防止するためである。即ち、反コモン基板側の固定部２３ｂ，２３ｂを上記の形状に形成すると、液晶表示素子１０はＹ方向に固定されないため、複数の保持部２３ｂがＹ方向の衝撃力を受け持つことになる。このため、液晶表示素子１０に発生する応力は分散されるので、過大な応力集中が角部に発生することがない。よって、割れの発生が確実に防止される。
【００３８】
なお、保持部２３ａ，２３ｂ，２３ｂは隣接するフレキシブル回路基板１２，１２の間に位置し、コモン基板１１ａ及びセグメント基板１１ｂ，１１ｂの内縁部には、保持部２３ａ，２３ｂ，２３ｂが嵌合する切り欠き部１３が設けられている（図１参照）。従って、保持部２３ａ，２３ｂ，２３ｂはこれらの基板１１ａ，１１ｂを保持する機能も有する。
【００３９】
上記のような表示素子保持枠２０を用いた液晶表示装置では、次のようにして液晶表示素子１０が保持され、且つ固定される。
【００４０】
表示素子保持枠２０の内縁部に沿って光源５０の上にスペーサ６０を載せ、その上に液晶表示素子１０を載せる（図６（ｂ）参照）。液晶表示素子１０は表示素子保持枠２０の固定部２２ａ，２２ａ，２２ｂ，２２ｂ及び保持部２３ａ，２３ｂ，２３ｂの内側に位置する。液晶表示素子１０を挟んでスペーサ６０の上に別のスペーサ６０を載せ、表示素子保持枠２０に上フレーム３０を取り付ける。これにより、液晶表示素子１０は縁部がスペーサ６０，６０に把持され、Ｚ方向に固定される。また、Ｘ方向及びＹ方向にも一応固定される。
【００４１】
これに加えて、液晶表示素子１０は、表示素子保持枠２０の固定部２２ａ，２２ａ，２２ｂ，２２ｂ及び反コモン基板側の固定部２２ｂ，２２ｂに近い保持部２３ｂ，２３ｂにより、Ｘ方向及びＹ方向に確実に位置決めされる。また、Ｙ方向においては、液晶表示素子１０が両方の長辺側に設けられた各辺複数の保持部２３ｂ，２３ｂにより保持される。
【００４２】
このため、液晶表示素子１０がＸ方向及びＹ方向の衝撃を受けた場合には、図７（ａ）に示すように、液晶表示素子１０の長辺側の端面に加わるＹ方向の応力が分散し、液晶表示素子１０の角部、正確にはガラス電極部１０ａの角部に加わるＹ方向の応力が低減する。特に、反コモン基板側では、固定部２２ｂが液晶表示素子１０をＹ方向に固定しないので、液晶表示素子１０の角部にはＹ方向の応力が全く加わらない。
【００４３】
以上の構成により、本発明の表示素子保持枠２０によれば、液晶表示素子１０がＸ方向及びＹ方向に確実に固定されるにもかかわらず、その角部の破損が防止される。因みに、保持枠を用いた上記従来の固定構造では、図７（ｂ）に示すように、液晶表示素子１０を位置決めするための固定部２２によって、液晶表示素子１０の角部にＸ方向及びＹ方向とも大きな応力が発生しており、これに起因して、角部に破損が発生し易くなっている。
【００４４】
表示素子保持枠２０の保持部２３ａ，２３ｂ，２３ｂは、図８（ａ）に示すように、液晶表示素子１０の端面に対向する面を平面とすることができる。また、図８（ｂ）に示すように、その対向面を曲面とすることができる。上述の実施形態では平面が採用されている。平面の場合は保持部２３ａ，２３ｂ，２３ｂが液晶表示素子１０の端面に面接触し、液晶表示素子１０を保持する効果が大きい。曲面の場合は保持部２３ａ，２３ｂ，２３ｂが液晶表示素子１０の端面に線接触し、液晶表示素子１０を表示素子保持枠２０から取り出し易い。
【００４５】
また、保持部２３ａ，２３ｂ，２３ｂは、図９（ａ），（ｂ）に示すように、対向面が液晶表示素子１０の端面に平行なものでも、外側に傾斜したものでもよい。但し、対向面を外側に傾斜させた場合は、液晶表示素子１０を表示素子保持枠２０から取り出し易いという利点がある。
【００４６】
なお、本実施形態において、保持部２３ａ，２３ｂ，２３ｂは、液晶表示装置の組み付け状態において、上フレーム３０の下面に当接する構造になっている。このような構造によれば、組み付け状態において、上フレーム３０の位置決めを行うことができるので、上フレーム３０が不測に変形することがない。
【００４７】
液晶表示装置を構成する部材の材質及び製造方法は以下の通りである。
【００４８】
まず、表示素子保持枠２０の材質としてはＡＢＳを使用した。この材質はレキサンに対して安価であり、成形時の樹脂流動性にも優れているので、品質の安定化を図ることかできる。その色は、白色以外に遮光性を有した黒色等を使用することができる。
【００４９】
表示素子保持枠２０の製造方法としては射出成形を用いた。その場合、図１０に示すように、テーパーを大きくとった。こうすることにより、パーティクルラインからの離型が良くなり、不良品が少なくなる。また、金型の負担が軽減し、長期にわたって同じ金型を使用しても、安定した製品を得ることができる。
【００５０】
上フレーム３０は、電気溶融亜鉛メッキ板（ＳＥＣＣ）をプレス加工することにより製造した。コスト的にも、ステンレス鋼より安くなる。
【００５１】
下フレーム４０は、アルミニウムを使用し、内面に白色塗装を施したり、反射シート（例えば、東レ株式会社の商品番号Ｅ−６０Ｌ）をアクリル系粘着材を使って粘着することにより反射層を形成した。
【００５２】
スペーサ６０は、硬度２０のシリコンゴムとし、ＰＥＴテープと一体化することにより液晶表示素子１０の固定部材及びゴミ侵入防止部材として利用した。色は遮光色として黒色を用いた。光源５０は、ハリソン電機株式会社製の直径３．０ｍｍのランプを４本使用した。拡散板５１は三菱レーヨン株式会社の商品番号Ｎ９６１の乳白色アクリル樹脂を加工したものを使用した。その両面に設けた印刷パターンにより光源の出射光の均一性を高め、同時に光源の影をぼかした。印刷パターンは、表示素子側はタイホー工業株式会社の商品番号ＳＨ−１１５０１２８Ｕ−１５を用いた。光源側はタイホー工業株式会社の商品番号ＳＨ−１１５０１１５Ｌ−１５を用いた。
【００５３】
拡散シート５２には、ポリカーボネイトを使用した辻本電機株式会社の商品番号Ｄ１１１Ｔで厚み１４０μｍのものを用いた。
【００５４】
レンズ５３は、ＰＥＴを使用した住友３Ｍ株式会社の商品番号ＢＥＦ２を２枚重ねて構成した。表示素子側には凸部ピッチ２４μｍ，厚み１４０μｍのものを配し、光源側には凸部ピッチ５０μｍ，厚み１５５μｍのものを配し、それぞれの凸部が表示素子側を向き且つ互いにクロスするようにした。
【００５５】
保護シート５２は、ＰＥＴを使用した辻本電機株式会社の商品番号Ｄ１１７Ｕで厚みが１３０μｍのものを使用し、レンズの保護とゴミ侵入防止機能を持たせた。
【００５６】
（その他の実施形態）
上記の実施形態では、固定部として、液晶表示素子１０をＸ方向に位置決めし（固定し）、Ｙ方向に移動可能に支持する構造のものも用いたが、Ｘ方向及びＹ方向のいずれの方向にも液晶表示素子１０を固定する構造のものを用いることも可能である。この場合も、各辺に保持部を設けることにより液晶表示素子１０の角部に応力集中が発生するのを防止できるからである。
【００５７】
また、上記の実施形態では、保持部を表示素子保持枠２０の２つの長辺と、１つの短辺に形成したが、これはこの保持部にプリント基板の保持機能も持たせたためであり、液晶表示素子１０の角部の割れを防止する観点だけからみれば、長辺の１辺だけに設けるだけでよい。
【００５８】
また、２つの長辺のみならず２つの短辺に設けることも可能である。この場合は、Ｙ方向のみならずＸ方向の割れもより一層確実に防止できる利点がある。
【００５９】
また、上記の実施形態では、単純マトリックス方式の液晶表示装置に本発明を適用する場合について説明したが、アクティブマトリックス方式の液晶表示装置にも同様に適用できる。また、表示素子としては、液晶表示素子に限定されるものではない。
【００６０】
【発明の効果】
以上の本発明表示素子保持枠によれば、少なくとも保持枠本体の１辺に保持部が設けられているので、この保持部が表示素子を受けとめ、衝撃力を吸収する。従って、表示素子に外部からの衝撃力や振動が作用した場合であっても、表示素子の角部に応力集中が発生し、角部に割れが発生することがない。また、保持部と固定部の協働により、かかる場合に表示素子に水平方向の位置ずれが発生することがない。
また、特に請求項２記載の表示素子保持枠によれば、１辺の端部に近い位置ほど保持部を密に配設してあり、表示素子の角部の応力集中を一層緩和できるので、その分、より一層効率的に角部の割れを防止できる。
【００６１】
また、本発明の表示装置によれば、上記の様な効果を奏する表示装置を実現できる。
【００６２】
また、特に請求項７記載の表示装置によれば、保持部は、プリント基板を保持する機能も有しており、部品点数の削減に寄与できるので、表示装置のコストダウンを図ることができる。
【００６３】
また、特に請求項８記載の表示装置によれば、保持部を上フレームに当接させる構成をとるので、組み付け状態において、上フレームの位置決めを行うことができるので、上フレームが不測に変形することがない、といった利点がある。
【図面の簡単な説明】
【図１】本発明の表示装置の全体構造を示す分解斜視図。
【図２】本発明の表示装置を裏面側から示す分解斜視図。
【図３】照明装置の構造を示す分解斜視図。
【図４】本発明の表示素子保持枠の構造を示す斜視図。
【図５】（ａ）はコモン基板側を、（ｂ）は反コモン基板側をそれぞれ示す、固定部及び保持部の配置を示す平面図。
【図６】（ａ）は固定部及び保持部の配置の詳細を示す平面図、（ｂ）は（ａ）のＡ−Ａ線による断面図。
【図７】（ａ）は本発明を、（ｂ）は従来例をそれぞれ示す、衝撃を受けたときの応力分布を示す平面図。
【図８】（ａ）は保持部の対向面の形状の一例を示す平面図、（ｂ）は保持部の対向面の形状の他の例を示す平面図。
【図９】（ａ）は保持部の対向面のまた他の形状を示す側面図、（ｂ）は保持部の対向面の更にまた他の形状を示す側面図。
【図１０】保持枠の製造に使用される金型の断面図。
【図１１】従来の表示装置の固定構造を示す断面図。
【図１２】また別の従来の表示装置の固定構造を示す断面図。
【図１３】更にまた別の従来の表示装置の固定構造を示す分解斜視図。
【図１４】図１３の表示装置の保持枠を下フレームとともに示す斜視図。
【図１５】 図１３の固定構造の問題点を示す説明図。
【符号の説明】
１０ 液晶表示素子
１１ａ コモン基板（プリント基板）
１１ｂ セグメント基板（プリント基板）
１２ フレキシブル回路基板
２０ 表示素子保持枠
２１ 保持枠本体
２２ａ，２２ｂ 固定部
２３ａ，２３ｂ 保持部
３０ 上フレーム
４０ 下フレーム
５０ 光源
６０ スペーサ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display element holding frame suitable for holding a display element used in a display device such as a liquid crystal display device used for displaying information in an AV device, an OA terminal, an advertisement display device, and the like, and the display element holding The present invention relates to a display device having a frame.
[0002]
[Prior art]
Conventionally, liquid crystal display devices have been used as display devices for desktop televisions, desktop personal computers, word processors, and the like. Here, as a fixing structure of the liquid crystal display element in the liquid crystal display device, a structure using a spacer is generally used, which is disclosed in, for example, JP-A-6-138443 and JP-A-6-347762.
[0003]
In the fixing structure disclosed in Japanese Patent Laid-Open No. 6-138443, as shown in FIG. 11, a silicon spacer 3a is disposed on a lighting device 2 arranged inside a square frame-shaped holding frame 1. The liquid crystal display element 4 is placed, and the printed circuit board 5 disposed around the liquid crystal display element 4 is placed on the holding frame 1 through a sponge spacer 3b. And the upper frame 6 with a display window is covered, and the liquid crystal display element 4 is pressed from the surface side through the spacer 3a. Further, the printed circuit board 5 is pressed from the surface side through the sponge spacer 3b.
[0004]
According to this fixing structure, the liquid crystal display element 4 is fixed by being sandwiched between the spacers 3a and 3a from the front surface side and the back surface side. Therefore, according to this fixing structure, it is possible to improve the shock resistance and vibration resistance of the liquid crystal display element 4 in the vertical direction, that is, in the Z direction.
[0005]
In the fixing structure disclosed in Japanese Patent Laid-Open No. 6-347762, the liquid crystal display element 4 is mounted on the illumination device 2 via the spacer 3 as shown in FIG. A striped spacer 8 made of a resin thin plate having an adhesive layer formed on both surfaces is attached to the surface of the glass electrode portion formed on the outer edge portion of the liquid crystal display element 4, and protrudes to the back surface side on the inner edge portion of the upper frame 6. The spacer 8 is pressed by the protrusions 6a and 6a formed in this way.
[0006]
In addition to the fixing structure with these spacers, there is a structure in which the liquid crystal display element is fixed with a holding frame. FIG. 13 shows a liquid crystal display device using this fixing structure, and FIG. 14 shows the holding frame together with the lower frame.
[0007]
The holding frame 20 accommodated in the lower frame 40 includes a rectangular frame-shaped holding frame main body 21, and fixing portions 22 provided at four corners of the inner edge portion of the holding frame main body 21. Each fixing portion 22 protrudes on the surface side (upper surface side) of the holding frame main body 21 and is formed in a shape bent at a right angle in plan view, and the liquid crystal display element 10 is parallel to the surface in two directions, that is, parallel to the long side. The X direction and the Y direction parallel to the short side are fixed. The liquid crystal display element 10 is placed on a lighting device arranged inside the holding frame main body 21 via a silicon spacer 60, and another silicon spacer 60 is placed thereon, and the upper frame is viewed from the surface side. The liquid crystal display element 10 is fixed by screwing 30 to the holding frame 20.
[0008]
In this state, the fixing portions 22 at the four corners of the holding frame 20 are in contact with end faces sandwiching the respective corner portions of the liquid crystal display element 10 (see FIG. 15) to fix the liquid crystal display element 10 in the X direction and the Y direction. . Reference numerals 11a, 11b, and 11b are printed boards, 11a is a common board, and 11b and 11b are segment boards.
[0009]
[Problems to be solved by the invention]
By the way, in the fixing structure disclosed in JP-A-6-138443 and JP-A-6-347762, the liquid crystal display element 4 is basically fixed by being sandwiched by spacers from the front side and the back side. Therefore, with respect to an impact in a direction parallel to the surface, that is, an impact force or a vibration acting in the X direction and the Y direction, a positional shift is likely to occur in that direction.
[0010]
When the fixed liquid crystal display element 4 is displaced in the X direction or the Y direction, a force in a direction corresponding to the flexible circuit board 7 that electrically connects the liquid crystal display element 4 and the surrounding printed circuit board 5 acts. The circuit board 7 may be peeled off or disconnected, which may impair the quality of the liquid crystal display device.
[0011]
In order to prevent damage to the flexible circuit board 7 due to the displacement of the liquid crystal display element 4, in the fixing structure disclosed in Japanese Patent Laid-Open No. 6-138443, the printed board 5 is placed on the sponge spacer 3c. The printed circuit board 5 follows the movement of the liquid crystal display element 4. However, when the impact force from the outside is large, the amount of displacement increases correspondingly. Can not be reliably prevented.
[0012]
On the other hand, in the fixing structure using the holding frame 20 as shown in FIGS. 13 and 14, the liquid crystal display element 10 is surely secured in the X direction and the Y direction by the four fixing portions 22 provided at the four corners of the inner edge portion of the holding frame body 21. Is positioned.
[0013]
However, in this fixed structure, since the liquid crystal display element 10 is so-called rigidly joined, for example, when an impact force or vibration is applied from the outside in the X direction or the Y direction, the corner, that is, the corner of the glass electrode portion 10a. Cause stress concentration.
[0014]
Here, the liquid crystal display element 10 in the illustrated example is longer in the X direction than in the Y direction. For this reason, stress concentration is particularly likely to occur in the Y direction with the same impact force. As a result, in this fixed structure, when an external impact force or vibration is applied to the liquid crystal display element 10, a stress exceeding an allowable value is likely to occur in the Y direction of the corner portion. There is a problem that a crack (stress crack) C as shown in FIG. 15 occurs.
[0015]
The present invention has been made in view of such circumstances, and a display element holding frame capable of reliably preventing damage to the display element due to displacement and stress concentration of the display element when subjected to an external impact, and the display element holding frame. An object of the present invention is to provide a display device including
[0016]
[Means for Solving the Problems]
The display element holding frame of the present invention has a rectangular frame shape, and holds and fixes a flat display element at the inner edge, and the display element is fixed to each corner of the holding frame body. Each fixing portion provided on both sides of the first side of the holding frame main body abuts against two end faces sandwiching the corresponding corner portion of the display element, Each fixing portion provided on both sides of the second side facing the first side in the holding frame main body is adapted to abut only on the end face of the display element along the second side, the inner edge of the holding frame body, the display respectively on the end surfaces along the sides other than the first and second sides in contact with the element, a plurality of holding portions for receiving the external force acting on said display device provided, the holding portion of said plurality of, the second side of the holding frame body It features a position as are densely arranged close to the parts, the objects can be achieved.
[0018]
Preferably, a surface of the holding portion that faces the end surface of the display element is parallel to the end surface.
[0019]
Preferably, a surface of the holding portion that faces the end surface of the display element is inclined outward with respect to the end surface.
[0020]
Preferably, a fixing portion for fixing the display element is provided in at least one corner of the holding frame main body.
[0021]
The display device of the present invention includes a flat display element, a printed circuit board that is disposed around the display element and has a drive circuit that drives the display element, and the printed circuit board is electrically connected to the display element. A flexible circuit board connected to the display board; a display element holding frame for holding the display element together with the printed board and the flexible circuit board; and the display element, the printed board, the flexible circuit board, and the display element holding frame. The display element holding frame is any one of the display element holding frames described above, whereby the above-described object is achieved.
[0022]
Preferably, the holding part of the display element holding frame is positioned between adjacent flexible circuit boards and fits into a notch provided in an inner edge part of the printed board.
[0023]
Preferably, at least one holding portion of the holding portion is in contact with the upper frame.
[0024]
The operation will be described below.
[0025]
When the holding portion as described above is provided, an impact force or vibration is applied to the display element from the outside. When an impact force in a direction parallel to the surface is applied to the display element, the impact force is received by the holding portion, and the impact force is applied. Absorb. Therefore, for example, if a plurality of holding portions are provided on one side of the holding frame main body, each holding portion absorbs the impact force substantially evenly, so that the stress generated in the display element is dispersed. That is, stress concentration can be relaxed. For this reason, stress cracks do not occur at the corners of the display element.
[0026]
Here, when providing a some holding | maintenance part, the position is good to provide densely, for example in the position near the edge part of one side. In other words, in this way, since more holding portions are disposed in places where stress concentration is likely to occur, the function of relaxing stress concentration can be improved, and stress cracking can be prevented more efficiently. Because.
[0027]
In the display device of the present invention, the above-described holding unit also has a function of fitting to and holding the printed board. Therefore, there is no need to separately provide a holding member for holding the printed circuit board, which can contribute to a reduction in the number of parts.
[0028]
Moreover, according to the structure which makes a holding | maintenance part contact | abut to an upper frame, since an upper frame can be positioned in an assembly | attachment state, an upper frame does not deform | transform unexpectedly.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0030]
FIG. 1 shows an embodiment in which the present invention is applied to a simple matrix type liquid crystal display device. The liquid crystal display device includes an upper frame 30, a liquid crystal display element 10, a display element holding frame 20, and a lower frame 40, and these members are screwed and integrated, and the upper frame 30 is crimped to fix the lower frame 40. It has a basic structure.
[0031]
The liquid crystal display element 10 has a rectangular shape that is long in the front-rear direction in the figure, and a printed circuit board, that is, a common circuit board 11a and segment substrates 11b and 11b are provided around it. More specifically, the common substrate 11a is on the short side of the front side of the liquid crystal display element 10 in the figure, and is electrically connected to the liquid crystal display element 10 by the flexible circuit board 12 (see FIG. 6A). ing. The segment substrates 11 b and 11 b are on the long sides corresponding to the left and right sides of the liquid crystal display element 10, and are electrically connected to the liquid crystal display element 10 by the flexible circuit board 12. Ground terminals 14 and 14 are attached to one end portions of the segment substrates 11b and 11b.
[0032]
In the following description, the direction parallel to the long side of the liquid crystal display element 10 is referred to as the X direction, the direction parallel to the short side is referred to as the Y direction, and the thickness direction is referred to as the Z direction. The short side on which the common substrate 11a is provided is referred to as a common substrate side, and the other short side is referred to as an anti-common substrate side.
[0033]
The liquid crystal display element 10 is held in the liquid crystal display device using the display element holding frame 20 of the present invention. The display element holding frame 20 is accommodated between an upper frame 30 having a display window and a dish-shaped lower frame 40. The upper frame 30 is attached to the surface of the display element holding frame 20 with screws 31 and caulking. As shown in FIG. 2, the lower frame 40 is attached to the back surface of the display element holding frame 20 with screws 41. A plurality of light sources 50 are attached to the display element holding frame 20 from the back side. As shown in FIG. 3, a diffusion plate 51, a diffusion sheet 52, a lens 53, and a protective sheet 54 are stacked on the light source 50 from the bottom to the top through an air layer. The liquid crystal display element 10 is disposed on the surface.
[0034]
As shown in FIG. 4, the display element holding frame 20 has a rectangular frame-shaped holding frame main body 21 having an opening of almost the same size as the liquid crystal display element 10. On the outer edge portion of the holding frame main body 21, a mounting convex portion 24 having a screw hole is provided. Fixing portions 22 a, 22 a, 22 b, and 22 b that are protrusions protruding from the front surface side of the holding frame main body 21 are provided at the four corners of the inner edge portion of the holding frame main body 21. In addition, a plurality of holding portions 23a, 23b, and 23b on each side are provided on the inner edge portion of the holding frame main body 21 along each side except the short side on the anti-common substrate side.
[0035]
The fixing portions 22a, 22a, 22b, and 22b and the holding portions 23a, 23b, and 23b have different configurations on the common substrate side and the anti-common substrate side. On the common substrate side, as shown in FIG. 5A, the fixing portion 22a is formed in a shape bent at a right angle in plan view, and the two receiving portions sandwich the corner portion of the liquid crystal display element 10. Abut one end face. The plurality of holding portions 23a are arranged at equal intervals in the Y direction and come into contact with the end surface of the liquid crystal display element 10 on the common substrate side.
[0036]
On the side opposite to the common substrate, as shown in FIGS. 5B and 6, the two fixing portions 22b and 22b are formed in a shape having protrusions only in the Y direction, and these protrusions are liquid crystal display elements. 10 is in contact with the end surface on the side opposite to the common substrate. That is, unlike the common substrate side, it is in contact with only one end face. The holding portions 23b and 23b provided along the long sides on both sides are arranged at regular intervals except for the end portion on the anti-common substrate side, and approach the fixing portions 22b and 22b at the end portion on the anti-common substrate side. They are lined up closely. This is because the fixing portions 22b and 22b on the side opposite to the common substrate do not have a function of fixing the liquid crystal display element 10 in the Y direction, and the holding portions 23b and 23b share the function.
[0037]
Here, the fixing portions 23b and 23b do not have a function of fixing the liquid crystal display element 10 in the Y direction on the side opposite to the common substrate, and the fixing portions 23a and 23a fix the liquid crystal display element 10 in the X direction and Y direction on the common substrate side. The reason for fixing is to prevent stress concentration from occurring at the corner portion of the liquid crystal display element 10 when an external impact force is applied in the Y direction, and cracking at this portion. That is, when the fixing portions 23b, 23b on the side opposite to the common substrate are formed in the above-described shape, the liquid crystal display element 10 is not fixed in the Y direction, so that the plurality of holding portions 23b take an impact force in the Y direction. For this reason, since the stress generated in the liquid crystal display element 10 is dispersed, excessive stress concentration does not occur in the corners. Therefore, generation | occurrence | production of a crack is prevented reliably.
[0038]
The holding portions 23a, 23b, and 23b are located between the adjacent flexible circuit boards 12 and 12, and the holding portions 23a, 23b, and 23b are fitted to the inner edges of the common substrate 11a and the segment substrates 11b and 11b. A notch 13 is provided (see FIG. 1). Accordingly, the holding portions 23a, 23b, and 23b also have a function of holding these substrates 11a and 11b.
[0039]
In the liquid crystal display device using the display element holding frame 20 as described above, the liquid crystal display element 10 is held and fixed as follows.
[0040]
A spacer 60 is placed on the light source 50 along the inner edge of the display element holding frame 20, and the liquid crystal display element 10 is placed thereon (see FIG. 6B). The liquid crystal display element 10 is positioned inside the fixing portions 22a, 22a, 22b, and 22b and the holding portions 23a, 23b, and 23b of the display element holding frame 20. Another spacer 60 is placed on the spacer 60 with the liquid crystal display element 10 interposed therebetween, and the upper frame 30 is attached to the display element holding frame 20. Thereby, the edge of the liquid crystal display element 10 is held by the spacers 60 and 60 and fixed in the Z direction. Moreover, it is temporarily fixed in the X direction and the Y direction.
[0041]
In addition to this, the liquid crystal display element 10 has the X-direction and Y-direction by the holding portions 23b, 23b close to the fixing portions 22a, 22a, 22b, 22b of the display element holding frame 20 and the fixing portions 22b, 22b on the opposite common substrate side. Positioned reliably in the direction. Further, in the Y direction, the liquid crystal display element 10 is held by a plurality of holding portions 23b and 23b provided on both long sides.
[0042]
Therefore, when the liquid crystal display element 10 receives an impact in the X direction and the Y direction, the stress in the Y direction applied to the end surface on the long side of the liquid crystal display element 10 is dispersed as shown in FIG. In addition, the stress in the Y direction applied to the corner of the liquid crystal display element 10, more precisely, the corner of the glass electrode portion 10a is reduced. In particular, since the fixing portion 22b does not fix the liquid crystal display element 10 in the Y direction on the side opposite to the common substrate, no stress in the Y direction is applied to the corner portion of the liquid crystal display element 10 at all.
[0043]
With the above configuration, according to the display element holding frame 20 of the present invention, the liquid crystal display element 10 is reliably fixed in the X direction and the Y direction, but the corner portions are prevented from being damaged. Incidentally, in the conventional fixing structure using the holding frame, as shown in FIG. 7B, the fixing portion 22 for positioning the liquid crystal display element 10 causes the corners of the liquid crystal display element 10 to have X and Y directions. A large stress is generated in both directions, and the corner portions are easily damaged due to this.
[0044]
As shown in FIG. 8A, the holding portions 23 a, 23 b, and 23 b of the display element holding frame 20 can have a plane that faces the end face of the liquid crystal display element 10. Moreover, as shown in FIG.8 (b), the opposing surface can be made into a curved surface. In the above-described embodiment, a flat surface is adopted. In the case of a flat surface, the holding portions 23a, 23b, and 23b are in surface contact with the end face of the liquid crystal display element 10, and the effect of holding the liquid crystal display element 10 is great. In the case of a curved surface, the holding portions 23 a, 23 b and 23 b are in line contact with the end face of the liquid crystal display element 10, and the liquid crystal display element 10 can be easily taken out from the display element holding frame 20.
[0045]
Further, as shown in FIGS. 9A and 9B, the holding portions 23a, 23b, and 23b may have a facing surface that is parallel to the end surface of the liquid crystal display element 10 or that is inclined outward. However, when the opposing surface is inclined outward, there is an advantage that the liquid crystal display element 10 can be easily taken out from the display element holding frame 20.
[0046]
In the present embodiment, the holding portions 23a, 23b, and 23b are configured to contact the lower surface of the upper frame 30 when the liquid crystal display device is assembled. According to such a structure, since the upper frame 30 can be positioned in the assembled state, the upper frame 30 is not unexpectedly deformed.
[0047]
The material and manufacturing method of the members constituting the liquid crystal display device are as follows.
[0048]
First, ABS was used as the material of the display element holding frame 20. Since this material is cheaper than lexan and has excellent resin fluidity during molding, the quality can be stabilized. As the color, black having a light shielding property other than white can be used.
[0049]
Injection molding was used as a method for manufacturing the display element holding frame 20. In that case, as shown in FIG. By doing so, release from the particle line is improved and defective products are reduced. Further, the burden on the mold is reduced, and a stable product can be obtained even if the same mold is used over a long period of time.
[0050]
The upper frame 30 was manufactured by pressing an electrogalvanized plate (SECC). In terms of cost, it is cheaper than stainless steel.
[0051]
The lower frame 40 is made of aluminum and coated with white on the inner surface, or a reflective sheet (for example, product number E-60L manufactured by Toray Industries, Inc.) is adhered using an acrylic adhesive material to form a reflective layer. .
[0052]
The spacer 60 was made of silicon rubber having a hardness of 20, and was used as a fixing member for the liquid crystal display element 10 and a dust intrusion prevention member by being integrated with a PET tape. The color used was black as the shading color. As the light source 50, four lamps having a diameter of 3.0 mm manufactured by Harrison Electric Co., Ltd. were used. As the diffusion plate 51, a product obtained by processing milky white acrylic resin having a product number N961 manufactured by Mitsubishi Rayon Co., Ltd. was used. The printed pattern provided on both sides improved the uniformity of the light emitted from the light source and at the same time blurred the shadow of the light source. As the print pattern, product number SH-1150128U-15 of Taiho Industry Co., Ltd. was used on the display element side. On the light source side, product number SH-1150115L-15 of Taiho Industry Co., Ltd. was used.
[0053]
As the diffusion sheet 52, a product number D111T of Enomoto Electric Co., Ltd. using polycarbonate and having a thickness of 140 μm was used.
[0054]
The lens 53 was formed by stacking two product numbers BEF2 of Sumitomo 3M Co., Ltd. using PET. A projection having a pitch of 24 μm and a thickness of 140 μm is arranged on the display element side, and a projection having a projection pitch of 50 μm and a thickness of 155 μm is arranged on the light source side so that the respective projections face the display element side and cross each other. I made it.
[0055]
As the protective sheet 52, a product number D117U of Enomoto Electric Co., Ltd. using PET and having a thickness of 130 μm was used to provide a lens protection function and a dust intrusion prevention function.
[0056]
(Other embodiments)
In the embodiment described above, the liquid crystal display element 10 is positioned (fixed) in the X direction and supported so as to be movable in the Y direction as the fixed portion. However, either direction of the X direction or the Y direction is used. It is also possible to use a structure that fixes the liquid crystal display element 10. Also in this case, it is possible to prevent stress concentration from occurring at the corners of the liquid crystal display element 10 by providing holding portions on each side.
[0057]
Further, in the above embodiment, the holding portion is formed on two long sides and one short side of the display element holding frame 20, but this is because the holding portion also has a holding function of the printed circuit board. From the viewpoint of preventing breakage of the corners of the liquid crystal display element 10, it is only necessary to provide it on one long side.
[0058]
It is also possible to provide not only two long sides but also two short sides. In this case, there is an advantage that cracks in the X direction as well as the Y direction can be more reliably prevented.
[0059]
In the above-described embodiment, the case where the present invention is applied to a simple matrix liquid crystal display device has been described. However, the present invention can be similarly applied to an active matrix liquid crystal display device. Further, the display element is not limited to the liquid crystal display element.
[0060]
【The invention's effect】
According to the above display element holding frame of the present invention, since the holding portion is provided at least on one side of the holding frame body, the holding portion receives the display element and absorbs the impact force. Therefore, even when an external impact force or vibration is applied to the display element, stress concentration occurs in the corner portion of the display element, and cracks do not occur in the corner portion. Further, due to the cooperation of the holding part and the fixing part, in such a case, the horizontal displacement of the display element does not occur.
Further, in particular, according to the display element holding frame according to claim 2, the holding part is arranged closer to the end of one side, and the stress concentration at the corners of the display element can be further relaxed. Accordingly, cracks at the corners can be prevented more efficiently.
[0061]
Further, according to the display device of the present invention, it is possible to realize a display device that exhibits the above effects.
[0062]
In particular, according to the display device of the seventh aspect, since the holding unit also has a function of holding the printed circuit board and can contribute to the reduction of the number of parts, the cost of the display device can be reduced.
[0063]
Further, according to the display device of the eighth aspect, since the holding portion is configured to abut on the upper frame, the upper frame can be positioned in the assembled state, so that the upper frame deforms unexpectedly. There is an advantage that there is nothing.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an overall structure of a display device of the present invention.
FIG. 2 is an exploded perspective view showing the display device of the present invention from the back side.
FIG. 3 is an exploded perspective view showing a structure of a lighting device.
FIG. 4 is a perspective view showing a structure of a display element holding frame of the present invention.
FIGS. 5A and 5B are plan views showing the arrangement of the fixing portion and the holding portion, showing the common substrate side and FIG. 5B showing the non-common substrate side, respectively.
6A is a plan view showing details of the arrangement of the fixing portion and the holding portion, and FIG. 6B is a sectional view taken along line AA in FIG.
7A is a plan view showing a stress distribution when subjected to an impact, wherein FIG. 7A shows the present invention, and FIG. 7B shows a conventional example, respectively.
8A is a plan view showing an example of the shape of the opposing surface of the holding portion, and FIG. 8B is a plan view showing another example of the shape of the opposing surface of the holding portion.
9A is a side view showing still another shape of the facing surface of the holding portion, and FIG. 9B is a side view showing still another shape of the facing surface of the holding portion.
FIG. 10 is a cross-sectional view of a mold used for manufacturing a holding frame.
FIG. 11 is a cross-sectional view showing a fixing structure of a conventional display device.
FIG. 12 is a cross-sectional view showing a fixing structure of another conventional display device.
FIG. 13 is an exploded perspective view showing still another conventional display device fixing structure.
14 is a perspective view showing a holding frame of the display device of FIG. 13 together with a lower frame.
FIG. 15 is an explanatory view showing a problem of the fixing structure of FIG.
[Explanation of symbols]
10 Liquid crystal display element 11a Common substrate (printed circuit board)
11b Segment substrate (printed circuit board)
12 flexible circuit board 20 display element holding frame 21 holding frame body 22a, 22b fixing part 23a, 23b holding part 30 upper frame 40 lower frame 50 light source 60 spacer

Claims (6)

角枠状をなし、内縁部で平板状の表示素子を保持・固定する保持枠本体と、
該保持枠本体の各隅部に、該表示素子を固定するようにそれぞれ設けられた固定部とを備え、
該保持枠本体における第１の辺の両側に設けられた各固定部が、該表示素子の対応する角部を挟む２つの端面にそれぞれ当接し、該保持枠本体における第１の辺に対向する第２の辺の両側に設けられた各固定部が、該第２の辺に沿った前記表示素子の端面にのみそれぞれ当接するようになっており、
該保持枠本体の内縁部には、前記表示素子における前記第１および第２の辺以外の各辺に沿った端面にそれぞれ当接して、該表示素子に作用する外力を受け止める複数の保持部が設けられており、
該複数の保持部が、前記保持枠本体の第２の辺の端部に近い位置ほど密に配設されていることを特徴とする表示素子保持枠。A holding frame body that has a rectangular frame shape and holds and fixes a flat display element at the inner edge,
A fixing portion provided at each corner of the holding frame main body to fix the display element;
The fixing portions provided on both sides of the first side in the holding frame body, respectively on the end face corresponding two sandwiching the corner portion of the display element abuts, opposite the first side of the holding frame body Each fixing portion provided on both sides of the second side is in contact with only the end face of the display element along the second side,
The inner edge of the holding frame body, the display respectively on the end surfaces along the sides other than the first and second sides in contact with the element, a plurality of holding portions for receiving the external force acting on said display device Provided,
The display element holding frame, wherein the plurality of holding parts are arranged closer to a position closer to an end of the second side of the holding frame main body . 前記保持部の前記表示素子の端面に対向する面が、該端面に平行である請求項１記載の表示素子保持枠。  The display element holding frame according to claim 1, wherein a surface of the holding portion that faces the end face of the display element is parallel to the end face. 前記保持部の前記表示素子の端面に対向する面が、該端面に対して外側に傾斜している請求項１記載の表示素子保持枠。  The display element holding frame according to claim 1, wherein a surface of the holding portion that faces the end face of the display element is inclined outward with respect to the end face. 平板状の表示素子と、
該表示素子の周囲に配設され、該表示素子を駆動する駆動回路を有するプリント基板と、
該プリント基板を該表示素子に電気的に接続するフレキシブル回路基板と、
該表示素子を該プリント基板及び該フレキシブル回路基板と共に保持する表示素子保持枠と、
該表示素子、該プリント基板、該フレキシブル回路基板及び該表示素子保持枠を収納し、これらを保持する上下フレームと
を備え、
該表示素子保持枠が、
請求項１〜請求項３記載のいずれかの表示素子保持枠である表示装置。A flat display element;
A printed circuit board disposed around the display element and having a drive circuit for driving the display element;
A flexible circuit board for electrically connecting the printed circuit board to the display element;
A display element holding frame for holding the display element together with the printed circuit board and the flexible circuit board;
The display element, the printed circuit board, the flexible circuit board, and the display element holding frame are accommodated, and an upper and lower frame for holding these are provided.
The display element holding frame is
A display device, which is the display element holding frame according to claim 1. 前記表示素子保持枠の前記保持部が、隣接するフレキシブル回路基板の間に位置し、且つ前記プリント基板の内縁部に設けられた切り欠き部に嵌合する請求項４記載の表示装置。  The display device according to claim 4, wherein the holding portion of the display element holding frame is located between adjacent flexible circuit boards and fits into a notch provided in an inner edge portion of the printed board. 前記保持部の少なくとも一の保持部が前記上フレームに当接する請求項４又は請求項５記載の表示装置。  The display device according to claim 4, wherein at least one holding portion of the holding portion is in contact with the upper frame.
JP22418196A 1996-08-26 1996-08-26 Display element holding frame and display device using the same Expired - Fee Related JP3714735B2 (en)

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TW086111698A TW390969B (en) 1996-08-26 1997-08-14 Holding frame and display apparatus incorporating the same
US08/912,557 US5889623A (en) 1996-08-26 1997-08-18 Holding frame and display apparatus incorporating the same
KR1019970040587A KR100272211B1 (en) 1996-08-26 1997-08-25 Holding frame and display apparatus incorporating the same

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KR19980018971A (en) 1998-06-05
US5889623A (en) 1999-03-30

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